20 On your new distributor, in this case our beautiful billet Pertronix Ignitor III-equipped distributor, locate the terminal you want to use for the number one spark plug wire (we suggest using the same terminal as your old distributor to prevent confusion) and mark the distributor body again. Lower the new distributor into place, moving the shaft a tooth at a time until the rotor lines up with your mark and the distributor is fully seated.